The Cooler Unit,air, cataloged under National Stock Number 4130-01-174-3744, is classified within Federal Supply Class 4130 (Refrigeration and Air Conditioning Components) of the Refrigeration, AC, and Air Circulating Equipment group. The manufacturer of record is Engineered Coil Company Dba Engineered Coil Co Div Drs Marlo Coil. Government technical data includes 23 specifications, cited from the U.S. Government catalog. The record lists 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4130-01-174-3744 |
| Primary Part Number | 81-H-1706-SZ21 TYPE II |
| Item Name | Cooler Unit,air |
| FSC / FSG | 4130 / 41 — Refrigeration and Air Conditioning Components |
| Manufacturer | Engineered Coil Company Dba Engineered Coil Co Div Drs Marlo Coil |
| Status | ACTIVE |
| Nominal Capacity in Btu Per Hour | 22200.0 COOLING AND 22200.0 HEATING |
| Return Connection Size | .750 IN. OD IN |
| Phase | SINGLE FAN MOTOR |
| Phase | SINGLE HEATER |
| Frequency in Hertz | 60.0 FAN MOTOR |
| Frequency in Hertz | 60.0 HEATER |
| Case with Built-in Condensate Drain Pan | INCLUDED |
| Current Type | AC FAN MOTOR |
| Current Type | AC HEATER |
| Heater Wattage Rating in Kilowatts | 2.5 |
| Connection Type | FLANGE UNION |
| Voltage in Volts | 115.0 FAN MOTOR |
| Voltage in Volts | 440.0 HEATER |
| Prime Mover Horsepower Rating | 0.067 |
| Nondefinitive Spec/std Data | II TYPE AND 21 SIZE |
| Tube Circuit Quantity | 24 |
| Fan Type | CENTRIFUGAL |
| Material | STEEL CASE |
| Material | COPPER TUBE |
| Coil Tube Quantity | 1 |
| Supply Connection Size | .750 IN. OD IN |
| Fan Drive Type | DIRECT |
| Cooling Medium | CHILLED WATER |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| 81-H-1706-SZ21 TYPE II PRIMARY | Engineered Coil Company Dba Engineered Coil Co Div Drs Marlo Coil (USA) |
| Reference | Meaning |
|---|---|
| MIL-A-23798 | 4/1 Identification reference U.S. Government activity |
NSN 4130-01-174-3744 is a Cooler Unit,air, manufactured by Engineered Coil Company Dba Engineered Coil Co Div Drs Marlo Coil, classified under FSC 4130, Refrigeration and Air Conditioning Components. Status: active.
NSN 4130-01-174-3744 has 1 manufacturer part number on file: 81-H-1706-SZ21 TYPE II (Engineered Coil Company Dba Engineered Coil Co Div Drs Marlo Coil).
Key specifications for 81-H-1706-SZ21 TYPE II: Nominal Capacity in Btu Per Hour: 22200.0 COOLING AND 22200.0 HEATING; Return Connection Size: .750 IN. OD IN; Overall Height: 42.000 INCHES NOMINAL IN; Phase: SINGLE FAN MOTOR. 23 specifications are documented in the U.S. Government catalog.
No hazard code in the DLA record (HMIC N). Hazard information on this page is shown exactly as it appears in the DLA record.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-16.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.